42421801 has 2 divisors, whose sum is σ = 42421802. Its totient is φ = 42421800.

The previous prime is 42421793. The next prime is 42421811. The reversal of 42421801 is 10812424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 16818201 = 5060^2 + 4101^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421801 - 2³ = 42421793 is a prime.

It is not a weakly prime, because it can be changed into another prime (42421811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210900 + 21210901.

It is an arithmetic number, because the mean of its divisors is an integer number (21210901).

Almost surely, 2^42421801 is an apocalyptic number.

It is an amenable number.

42421801 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421801 is an equidigital number, since it uses as much as digits as its factorization.

42421801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 42421801 is about 6513.2020542894. The cubic root of 42421801 is about 348.7624346915.

The spelling of 42421801 in words is "forty-two million, four hundred twenty-one thousand, eight hundred one".